US3539120A

US3539120A - Bowl liner securing device

Info

Publication number: US3539120A
Application number: US699066A
Authority: US
Inventors: Arnold P Szaj
Original assignee: Nordberg Manufacturing Co
Current assignee: Metso Minerals Milwaukee Inc; Nordberg Manufacturing Co
Priority date: 1968-01-19
Filing date: 1968-01-19
Publication date: 1970-11-10
Anticipated expiration: 1987-11-10

Description

United States Patent Arnold P. Szoj Hales Corners, Wisconsin Jan. 19, 1968 Nov. 10, 1970 Nordberg Manufacturing Company Milwaukee, Wisconsin a corporation of Wisconsin inventor Appl. No. Filed Patented Assignee BOWL LINER SECURING DEVlCE 6 Claims, 2 Drawing Figs.

11.8. CI. 241/299 int. Cl......, 1302c 2/04 Field oi Search 241/299,

Primary Examiner-Robert C. Riordon Assistant Examiner-Donald G. Kelly Attorney-Parker, Carter & Markey ABSTRACT: A device for securing a liner to the bowl of a gyratory crusher machine. A disposable element supports a locking member in engagement with a flange on the liner so that upon destruction of the element the liner may be rapidly unlocked and removed from the bowl.

BOWL LINER SECURING DEVICE SUMMARY OF THE INVENTION In gyratory cone crusher machines, the wearable liners for the crusher bowl and head must be replaced as the liner material wears thin. It is important to reduce the downtime during the liner replacement operation to increase the operating time for each machine and improve the efficiency of the crushing operation. It has been found difficult to rapidly remove the liner from the bowl because during the crushing operation the large reactive forces against the liner tend to bind the locking elements, making it difficult to unlock the liner. Furthermore, the dust created during crushing tends to settle around the locking elements and interfere with the unlocking operation.

Accordingly, it is an object of this invention to provide means for locking a liner to the bowl of a gyratory crusher which facilitates rapid unlocking of the liner to reduce the downtime during liner replacement.

Another object of this invention is to provide a device for locking a liner to the bowl of a gyratory crusher in which a disposable element is positioned to support a liner locking member, such as a locking wedge engaging a flange on the liner, so that the support element may be rapidly destroyed to release the locking force of the locking member.

Another important object of the present invention is to provide a wedge member for locking a liner to the bowl ofa gyratory crusher with a destructible element such as a length of nonyieldable material positioned to releasably support the wedge preventing outward radial movement thereof with respect to the liner. Means are provided between the support element and wedge to move the wedge inwardly into locking engagement with the liner. Destruction of the support element loosens the wedge so that it may be readily moved out of locking engagement with the liner to facilitate rapid liner change.

Still another object is to provide a bowl liner locking device for a gyratory crusher having a plurality of locking wedges which engage the liner flange and which carry a bolt for moving the wedge inwardly. A disposable element such as an ordinary steel bar is positioned between a cylindrical outer portion of the bowl and the outer end of the bolt to prevent radial outward movement of the wedge. This assembly permits rapid unlocking of the wedges from the liner flange by means of cutting the support elements. When a new liner is in place, the wedges may be reassembled simply by inserting a new support element between the outer bowl portion and the wedge bolts.

DESCRIPTION OF THE DRAWINGS FIG. I is a side elevation view in cross section of a portion of a gyratory crusher machine illustrating details of the invention; and

FIG. 2 is an enlarged side elevation view in cross section of component elements of the invention prior to locking engagement of the elements.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawings and particularly FIG. 1, a portion of a gyratory crusher for comminuting is illustrated generally at 10. The crusher comprises a crushing head 12 having a wearable mantle liner 14 mounted for gyratory movement within bowl 16. Material to be crushed is fed through hopper 18 into the space between the bowl and crushing head.

Bowl 16 comprises a generally cylindrical outer section 20 and a generally frustoconical inner section 22. A threaded portion 23 on bowl section 20 engages an adjustment ring mounted on a main frame, not shown.

A frustoconical bowl liner 24 constructed of a wearable material such as manganese steel is removably mounted within bowl section 22. A suitable backing material 26, such as zinc or epoxy, may be placed between the bowl and liner 24, as is well known. The bowl liner is formed with an upwardly and outwardly extending locking flange 28.

The bowl liner is locked to the bowl by means of a plurality of locking members 30 circumferentially disposed around the liner. In the preferred embodiment, each locking member may be formed with an inwardly projecting wedge-shaped nose portion 32 and an upstanding yoke 34 having radially extending

apertures

36 and 38, as best shown in FIG. 2.

Each of the locking members 30 is mounted for radial movement on a ledge 40 of the bowl and an annular plate 42 secured between the inner and outer bowl sections. The sides of the locking member move within

channels

51 and 44 formed in inner bowl section 22; this functions to prevent twisting of the locking member during the crushing operation.

Nose portion 32 of the locking member is in locking engagement with surface 46 formed on liner flange 28. Inward thrust of member 30 against the flange urges liner 24 upwardly against bowl 22 and backing material 26.

The upper and inner end of bowl section 22 may be formed with an annular cofferdam portion 48 formed with radially extending channels 51 to receive the nose portions of respective locking members. Cofferdam portions 48 function to prevent cold flow of the liner flange during crushing, which otherwise would make removal of the liner from the bowl extremely difficult.

Each of the locking members is held in locking engagement with the liner flange by means of a destructible support element 50 positioned radially between the inner surface of bowl section 20 and the outer end of the locking member. Element 50 is preferably fabricated from a relatively nonyieldable material, such as carbon steel bar stock. A support member 52 formed with an apertured aligning socket 53 may be secured to the inner surface of bowl section 20 to support the outer end of element 50 in alignment with the locking member.

The inner end of each support element 50 is preferably mounted with a respective locking member 30 by means of a threaded bolt 54 aligned with

yoke apertures

36 and 38. Alternatively, the support element may be in thrust receiving relationship with the locking member with the bolt being positioned between the outer bowl section and the outer end of the support element. A thrust nut 56 threadably engages bolt 54 constituting therewith a power means and is restrained from rotation within the two arms of the yoke. A driving arrangement, such as socket 58, may be provided to turn bolt 54 by suitable means such as an impact wrench. The outer end of each bolt is preferably formed with an enlarged portion 60 formed with a socket 62 for removably receiving the inner end of element 50. Socket 62 is of sufficient depth to prevent the end of element 50 from working loose due to twisting forces imparted thereto by locking member 30.

With liner 24 positioned adjacent bowl l6 and with backing material 26 in place, assembly of the lock elements may proceed as follows. Bolt 54 is turned by a wrench and moved inwardly relative tolocking member 30, which may be loosely positioned on the bowl against the liner flange 28. Support element 50 is next inserted into either one of the sockets 53 or 62 and bolt 54 is then turned to move outwardly and take up the slack between bowl section 20, support element 50, and the bolt. The elements would thus be positioned as shown in FIG. 2. Further turning of the bolt will produce the desired locking force against liner flange 28.

When the liner is worn to the extent that replacement is necessary, the locking elements may be rapidly removed to unlock liner 24 by destroying the disposable support elements. This may be accomplished by any suitable means, such as by cutting element 50 with an acetylene cutting torch applied through gap 63 between support member 52 and bolt portion 60. it may then be necessary to strike locking member 30 with several blows of a hammer to loosen nose 32 from underneath liner flange 28. After this, the locking member will easily slide outwardly on ledge 40 and plate 42 to permit removal of liner 24 from bowl l6. 7

It is apparent that applicant has provided a locking device which will rapidly unlock the liner from the bowl of a gyratory crusher. This unlocking can be accomplished in a much shorter time span as compared to locking devices in which, for

example, a bolt is used to advance the locking member from underneath the liner flange and in which the bolts may bind to make unlocking extremely difflcult. Moreover, with applicants device the locking assembly may be readily reassembled with a new liner by the replacement of a new support element, which is an inexpensive and expendable part. Locking member 30, bolt 54, and thrust nut 56 may be reused throughout an indefinite number of liner replacements.

it will be understood that various changes in the details, material, and arrangement of parts, which have been described and illustrated in order to explain the nature of the invention, may be made by those skilled in the art within the principle and scope of the invention as expressed in the appended claims.

I claim:

1. A liner locking device for use with a gyratory crusher having a crushing head mounted for movement within a bowl and a bowl liner mounted between the bowl and the head, the liner having a locking flange, the locking device comprising the combination of: a plurality of locking members mounted on the bowl, each mounted for generally radial movement toward and away from the locking flange on the liner to lock and unlock the liner in the bowl; power means for moving the locking elements inwardly to engage the locking flange and lock the liner in the bowl; and an elongated, destructible, expendible element separate from and engaging the power means, said destructible element having an end face adapted to receive the thrust of the power means when the liner is locked in the crusher and to normally preclude unlocking movement of the locking member whereby destruction of the destructible element permits free outward movement of the locking member tending to unlock the liner,

2. The invention as defined in claim 1 and further characterized in that the locking member includes wedge means positioned under the flange to urge the liner upwardly against the bowl upon movement of the member to the liner.

3. The invention as defined in claim 1 and further characterized in that the power means comprises a radially aligned bolt threadably engaged with the locking member, said bolt being in thrust receiving relationship at its outer end with the inner end of the destructible element.

4. The invention as defined in claim 3 and further characterized in that the outer end of the bolt is provided with a socket, said socket having a radially aligned, outwardly facing opening, said destructible element being removably mounted in the opening of said socket.

5. The structure of claim 1 further characterized by and including a socket member secured to the bowl, the destructible element comprising a radially aligned bar removably mounted at its outer end in the socket member.

6. The structure of claim 1 further characterized in that each of-the locking elements slides in a generally radially disposed channel in the bowl.